Improvement in auricular permutation locks



E. E. STUBBS. -Improvement in Permutation-Locks. 671-2.,`

Patented JulyZ No; 12a

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IMPROVEMENT IN lAURICULAR PERMUTATION LOCKS.

Specification forming part of Letters Patent No. 128,672, dated July 2,1872.

Specication of a new and useful Improvement `in Auricular PermutationLocks, invent- A ed by me, ENooH E. SrUBBs, of West Elkton,

y ing device within the tumbler, as hereinafter described.

Description of the Drawing.

Figure 1 is a front elevation of a padlock embodying my invention, thesame being shown in its locked condition andV having its outer capremoved. Figs/,.2 and 3 are similar views, having, respectively, theintermediate and the innermost cap removed. Fig. 4 is an axial sectionof the locking mechanism on a larger scale. Fig. 5 is a plan of thelower disk. Fig. drepresents, by perspective, the several disks andwashers in the order of their superposition when in the lock.

The several parts are in the positions they assume at the commencementof the unlocking process.

A `is the case;` B, its cap, C, the bow or shackle, whose notch Dreceives, when locked, the hook E of dog F, whose tusk G enters thegates or notches l 2 3 of the revolving tumblers 0r disks H I J. A sear,K, caused to press upon the dog F by means of spring L, operates tothrow the tusk G into the gates of the tumblers whenever they arebrought into line. Of the three washers,.M N O, the upper one, O, isarmed around three-fourths of its periphery with teeth P, and all ofthem are held to a stationary position by a tongue, Q, which enters anotch, R, in the stud S,

about which all the tumblers and washers are centered and the tumblersrevolve. The tumbler I is made in box-form, and has a cap, T, secured byscrews U. The tumbler I has pivoted within it a T-formed click, V, whosepoint engages with the teeth P, so that when the said tumbler isrevolved the said point, in striking the successive teeth, makes anaudible clicking sound, capable of being easily counted by the operator.A spring, W, at back of the click V, holds the latter in contact withthe teeth of the washer with sufficient force to make the sounds ofimpact plainly audible. X are the customary pins or projections whichcommunicate motion from each tumber to thatv next below it in the mannerwell known with such locks.

The combination may be changed by shifting the pin X of the lowertumbler to any one of the holes Y.

As set up in the present illustration, the lock is operated as follows:To unlock, the knob or handle Z is given at least three entirerevolutions,'(in order to insure the contact of all the pins,) until theclick reaches the pause caused by the blank upper part of the washer O.The rotation to the right is then continued untilten successive clicksare heard. The knob is then rotated to the left seven clicks, and againto the right until the square shoulder a on the outermost tumbler J isfelt to impinge against the tusk G, that being an indication that thedog is gated and the shackle at libertyl to be withdrawn. To lock, theshackle is reinserted, and the knob being turned to the left sufcientlyfor the inclined side b of the notch on the upper tumbler to throw thedog out of gate, after which a continued rotation of the knob in eitherdirection operates to scatter the tumblers beyond the chance ofaccidental unlocking.

My invention is especially designed for padlocks.

I claim as new and of my invention- The box-tumbler I T U, click V,toothed washer O P Q, notched stud R S, and spring W, together withtheir described or equivalent accessories, arranged to operatesubstantially as and for the purpose set forth.

In testimony of which invention I hereunto set my hand.

' ENOGH E. STUBBS. Attest:

Guo. H. KNIGHT, J. B. FORAKER.

